Crank-pin or eccentric turning lathe.



No. 643,!72. Patgnted Feb. i3,-a900. A. TINDEL & o. ALBRECHT. CRANK FIN 08 ECCENTBIC TURNING LATHE.

(App icatio filed Apr. 25, 1898. Renewed July 13, 1899.)

(No Model. 4 Sheets-Sheet l.

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No. 643,021 Patented Feb. l3, I900. A. TINDEL & 0. ALBRECHT.

CRANK PIN 0B ECGENTRIC TURNING LATHE.

(Application filed. Apr. 25, 189B. Renewed July 13, 1899.)

(No Model.) 4 Sheets-Sheet 2..

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No. 643,172. v Patented Feb. l3, I900. A. TINDEL &. U. ALBRECHT.

CRANK PIN 0R ECCENTRIC TURNING LATHE.

(Application filed Apr. 25, 1898. Renewed July 13, 1899.) (No Model.) 4 Sheets$heet 3.

IIIJI'III Patented Feb. I3, 1900.

A. TINDEL 8:. D. ALBRECHT. BRANK FIN 08 ECCENTRIC TURNING LATHE.

(Application filed Apr. 25, 1898. Renewed July 13, 1899.)

4 Sheets-Sheet 4.

(No Model.)

lTED STATES PATENT OFFicE.

CRANK-PIN OR ECCENTRIC TURNING LATHE.

SPECIFICATION forming part of Letters Patent No. 643,172, dated February 13, 1900. Application filed April 25,1898. Renewed July 13,1899. Serial No. 723,717. (No model.)

T at whom, it may concern:

Be it known that we, ADAM TINDEL and Orrro ALBREOHT,citizens of the United States, and residents of Philadelphia, Pennsylvania, have'invented certain Improvements in Crank-Pin or Eccentric Turning Lathes, of which the followingis a specification.

Our invention consists of a lathe for turning the pins or other portions of crank and eccentric shafts, the object of our invention being to so construct such a lathe that it can be readily adapted for turning thepins of multiple crank-shafts or the eccentrics of multiple eccentric-shafts irrespective of the angle at which the cranks or eccentrics are set in respect to each other. This object we attain in the manner, hereinafter set forth,

' reference being bad to the accompanying drawings, in which- Figure 1 is a plan View, partly in. section, of a crank-pin-turning lathe constructed in accordance with our invention, a portion of the crank-shaft being shown by dotted lines and the two heads of the machine being brought more closely together than they would be in the actual lathe. Fig. 2 is aside view of the lathe, partly in section. Fig. 3 is an enlarged transverse section. Fig. 4 is an enlarged front view of the face-plate and its accessories. Fig. 5 is a detail of a modification hereinafter referred to.

The bed 1 of the lathe is of any suitable length and has secured to it near each end a head-block 2, and in each of these headblocks is securely mounted a fixed stud 3, on which can turn a face-plate 4, an adjustable tapered sleeve or bushing 5 serving to compensate for wear, and a pair of washers 6, interposed between the end of the stud 3 and the end of the central opening formed in the face-plate for the reception of said stud, serving to resist Wear caused by end thrust, one of the washers being secured to the stud and the other to the face-plate by suitable retaining-pins, as shown in Fig. 1. The faceplate is held in position on the stud by means of a flanged and adjustable retainer-bar 7,

which engages withan annular groove 9 in the hub of the face-plate and is secured to the upper portion of the head-block 2. The appurtenances of each of the face-plates '4 are alike. Hence a description of one will suffice for both.

On the front of the face-plate is a dovetailed transverse guide 10, to which is adapted a cross-head 11, said cross-head also carrying bolts 12, the heads of which are adapted 'to traverse slots 13 in the face-plate. In the projecting guide-rib 10 of the face-plate is a recess containing an adj Listing-screw 14, which is mounted in fixed bearings in said projecting guide-rib and engages a nut 15, secured to the cross-head 11, so that by ma nipulating said adj usting-screw 14 the crosshead may be caused to move back and forth across the face-plate 4 and may be secured in position after adjustment by tightening the nuts on the bolts 12. sliding cross-head register with similar openings 17 in the face-plate under (lifierent conditions of adjustment of the cross-head on the latter, and thus provide a ready means of determining the adjustment of the crossheads to suit cranks of different throw, the cross-heads being secured in place by means of dowel-pins 16, adapted to registering openings 17. Intermediate adjustments are provided for by a graduated scale on the faceplate, as shown in Fig. 4.

On the cross-head 11 is mounted a supplementary face-plate 19, which has bolts 20 engaging with a ring 21, adapted to an annular recess in the cross-head, so that the face-plate 19'can be turned on the latter, and to suitable guides on said face-plate 19 are adapted a pair of clamping-jaws 22, which can be caused to move toward each other by tight ening-nuts upon clamping-bolts, 23. Hence these jaws can be firmly clamped upon the end portion of a crank-shaft upon which the lathe is to act, the sliding cross-head 11 having a projecting center pin 24 for properly centering said shaft before the clutch-jaws are tightened upon the same. The supplementary face-plate is made in halves bolted together as shown in Figs. 1, 2, and 4, so that it can be removed whenit is desired to turn the end portion of the crank-shaft beyond the cranks.

The peripheries of the supplementary face plate 19 and of the adjacent portion of the cross-head 11 are graduated, so that after'the Openings 17 in the cross-head has once been adjusted on the main face-plate, so as to properly center one of the crank-pins of a multiple crank in order to effect the turning of the same, future adjustments of the crank-shaft can be effected by simply turning the supplementary faceplate 19 throughout any desired number of degrees, in accordance with the angle at which the cranks of the shaft are set in respectto each other.

The tool-holder slide which We employ is adapted for carrying a series of cutting-tools, whereby we can at the same time turn not only a crank-pin, but also the outer curved portions of the crank-arms on each side of the same. In order to effect this result, the tool-holder slide 25 is T-shaped-that is to say, it has a central projecting finger 26 and laterally-projecting portions 27so that it is adapted for carrying three tools, one for acting upon the crank-pin and one on each side of the same for acting upon the rounded ends of the crank'arms on each side of said crankpin, as shown in Fig. 1, the central projecting portion 26 of the tool-holder being of a length proportionate to the greatest throw of crank which is likely to be turned, so that the crank-arms will always swing clear of the side projecting portions 27 of the tool-holder slide.

Transverse adjustment of the tool-holder slide may be effected by any of the means usually employed for the purpose, and the cutting-tools may be held in place on the slide by suitable clamps in any wel-k nown or available manner.

In order to provide a support for the crankpin and to prevent the springing of the shaft or cranks by the pressure of the cutting-tool upon said crank-pin, We secure to the longitudinally-traversing carriage of the machine a standard 29,constrncted, like the tool-holder slide, with a projecting tongue 30 to extend between the crank-arms, and in this standard is guided a transverse bearing block or rest 31, with V-shape'd recess in its inner end, so that it offers a back bearing or rest for the crank-pin on the side opposite that upon which the cutting-tool is acting, thereby affording the proper support to said crank-pin and preventing the springing of the crankshaft or cranks by the pressure of the cutting-tools. Transverseadjustment of the block 31 may be effected by' means of a nut 32, adapted to a screw-stein 33, projecting outwardly from the standard 29, as shown in Fig. 4.

Each of the face-plates 4t has a spur-wheel which meshes with'a'p'inion on the common driving-shaft 4: at the back of the lathe, so that the face-plates will be rotated in unison.

A taper-key 40 may be inserted between one of the side bars of .the bed and abearing on the tool-slide carrier, as shown in Fig. 3, so as to insure the proper firm bearing of said tool-slide carrier on its guides at all times.

WVhen it is desired to use the lathe for other work than the turning of crank-pins,the crossheads 11, with their supplementary faceplates 19, may be removed from the faceplates 4, and a plate 35, having a projecting center pin 36, may be secured to the face of the projecting rib 10 of each of the main faceplates, as shown in Fig. 5.

It will be evident that a lathe constructed in accordance with our invention provides a ready means for turning the crank-pins of multiple crank-shafts or the eccentrics of multiple eccentric-shafts, the readjustment of the shaft so as to permit the turning of one pin or eccentric after another being effected by a simple turning of the supplementary face-plate 19, while the adjustment of the cross-head 11 to accommodate the throw of the cranks or eccentrics can be effected with equal readiness.

The use of the two face-plates, one at each end of the shaft, permits us to balance the shaft more effectively than when but a single face-plate is used, as the balance-weights instead of being concentrated upon a single face-plate at one end of the shaft can be divided between two face-plates, thus balancing the shaft at each end, and thereby preventing that tendency to twist the shaft wh ch, n h c e o a la e ha u a gle face-plate, results when the shaft is being turned at the end farthest from said faceplate.

Having thus described our invention, we claim and desire to secure by Letters Patent- 1. The combination in a lathe for turning crank-pins or eccentrics, of a rotating main face-plate, a cross-head mounted so as to move transversely thereon, means for securing the cross-head to said face-plate after adjustment, and a supplementary face-plate mounted so as to rotate on said cross-head and having means for en gaging and holding the shaft, substantially as specified.

2. The combination in a crank-pin or eccentric turning lathe, of a rotating main faceplate, a cross-head mounted so as to move transversely thereon, means for securing the os -he d said f -pl a te a jus ment, a supplementary face-plate mounted so as to rotate on said cross-head, clampingjaws carried by said supplementary faceplate, and provision for opening and closing said clamping-jaws, substantially as specified.

3, The combination in a crank-pin or eccentric turning lathe, of a rotating 'nnain faceplate, a cross-head mounted so as to move transversely thereon, means for securing the cross-head to said face-plate after adjustment, a supplementary face-plate mounted so as to rotate on said cross-head, provision on said supplementary face-plate fQI ngaging and holding the shaft, and a center pin carried by the cross-head and cqncentric with the axis of rotation of the supplementary face-plate, substantially as specified.

4. The combination in a crank-pin or eccentric turning lathe, of a rotating main faceplate, a cross-head mounted so as to move transversely thereon, a supplementary faceplate mounted so as to rotate on said crosshead, a fixed stud on Which the main faceplate rotates, and bearing-washers interposed between the end of said stud and the faceplate, one of said washers being secured to the stud and the other to the face-plate, substantially as specified.

5. The combination in a crank-pin-turning lathe, of mechanism for holding and rotating the crank-shaft, with a multiple tool-holder slide having a projecting portion carrying a tool for acting on the crank-pin, and one or more laterally-projecting portions with tool for acting on the end of the crank-arm, substantially as specified.

6. The combination in a crank-pin or eccentric turning lathe, of a pair of rotating main face-plates geared together so as to rotate in unison, and each having a cross-head mounted thereon so as to move transversely, means for securing the cross-head to the face-plate head, and provided with means for clamping the shaft, said supplementary face-plate being composed of separable sections, whereby it can be removed to permit turning of the end portion of the shaft, substantially as specified.

In testimony whereof We have signed our names to this specification in the presence of two subscribing Witnesses.

ADAM TINDEL. OTTO ALBRECHT.

WVitnesses:

MURRAY 0. BOYER, J os. H. KLEIN. 

